JP3289809B2 - Refractory dismantling method for vertical tubular structures - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for efficiently and safely crushing and removing internal wall bricks (refractory) of a vertical tubular structure such as a hot blast stove and the like. It is about.

[0002]

2. Description of the Related Art A hot blast stove comprises a heat storage chamber, a combustion chamber, and a blast mixer. The hot blast furnace is burned by gas and air in the combustion chamber, stores heat to a predetermined temperature in the heat storage chamber, and is appropriately blown by a blast mixer. This facility aims to send hot blast to the blast furnace. FIG. 3 is a sectional view of a hot air stove heat storage chamber. As shown in FIG. 3, the heat storage chamber A includes a peripheral wall brick 2 inside a steel shell 1 and a checker brick 3. FIG. 4 is a sectional view of the combustion chamber of the hot blast stove. As shown in FIG. 4, the combustion chamber B is configured by the peripheral wall brick 2 inside the steel shell 1, and unlike the heat storage chamber A, the interior is a hollow portion 4.

Conventionally, dismantling of refractories of a hot blast stove requires a large amount of labor and time because a worker enters the furnace in both the heat storage chamber and the combustion chamber and uses a small breaker / hammer or the like. This was a very dangerous operation because an accident occurred due to unexpected fall and collapse of the deteriorated refractory itself. In addition, there was almost no protection.

[0004] In view of the above, in recent years,
Means such as mechanization and blasting have been used for the dismantling work of refractories, so that there is almost no need to directly engage in dismantling and crushing work by human power.

[0005] As an example of the mechanization of such dismantling work,
JP-B-45-19468 (hereinafter referred to as "prior art 1")
And Japanese Patent Publication No. 55-5039 (hereinafter referred to as “prior art 2”). These are common in the development of a special machine for dismantling refractories.

On the other hand, as an example of dismantling work due to blasting, etc.,
JP-A-52-44703 (hereinafter referred to as "prior art 3")
And Japanese Patent Publication No. 60-44365 (hereinafter referred to as “prior art 4”). These are methods of destroying refractories by means of blasting,
Prior arts 3 and 4 are disassembly methods only in a range where checker bricks in a hot air stove heat storage chamber can be used as a scaffold.

Further, Japanese Patent Application Laid-Open No. 57-90576 discloses that
By setting up a gondola and other elevating equipment, it will be used to carry out work for blasting (hereafter,
"Prior art 5").

[0008]

However, in the prior art, especially in a combustion chamber having a hollow interior, it is necessary to carry out the work effectively in order to carry out the work effectively regardless of the means of mechanization and blasting. There is a need for a reliable scaffolding and the installation of a gantry etc. is indispensable, and further, there are the following problems.

[0009] In the prior art 1, a dedicated gantry for supporting the machine is required. In Prior Art 2, since it is necessary to support up and down, the disassembly device is dedicated to the dome portion. These machines are expensive to develop and manufacture and require a great deal of money and time to install a dedicated support stand. In addition, there is a problem that there is no versatility for equipment having different scales.

The prior arts 3 and 4 exhibit their effectiveness only by utilizing the refractory material in the heat storage chamber, and have the disadvantage that the technique cannot be realized in the combustion chamber. for that reason,
For disassembly, a dedicated scaffold is required, as is the use of a dedicated machine. As an example, the prior art 5 requires a lift such as a gondola, so that a dedicated stand is required. In order to set up these dedicated scaffolds or gantry, it is necessary to rely on manual labor in the furnace. In this case, the worker enters the furnace of the hot blast stove as in the demolition work, which requires a lot of labor and time. Work, and there remains a very dangerous problem.

The above problem will be described in detail by taking a dismantling operation by mechanization as an example. In the dismantling of the hot air stove heat storage chamber A shown in FIG. 3, a heavy machine is attached to the upper surface 3a of the checker brick 3 and the checker brick 3 itself is used. If it is arranged as a scaffolding material and the dismantling of the surrounding wall bricks 2 and the checker bricks 3 is advanced, the scaffold naturally decreases accordingly, and the dismantling of the surrounding wall bricks 2 and the checker bricks 3 from the top to the bottom of the heat storage chamber A is performed. Can be.

However, in the dismantling of the peripheral wall brick 2 of the combustion chamber B shown in FIG. 4, in order to use a heavy machine, a dedicated scaffold 5 made of steel, for example, must be provided in the cavity 4 as shown in FIG. I have to.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems, and to improve the refractories on the inner wall of a tower-like structure having a cavity therein, such as a combustion chamber of a hot blast stove, by using a general-purpose heavy machine generally used. It can be dismantled by using it, eliminating the need for manual dismantling work, eliminating the need to manufacture and assemble dedicated equipment and scaffolding for dismantling, and dismantling efficiently and inexpensively in a short period of time after ensuring sufficient safety. It is an object of the present invention to provide a method for disassembling a refractory of a vertical tubular structure.

[0014]

Means for Solving the Problems The inventors have made intensive studies to solve the above-mentioned problems. As a result, an inexpensive, light-weight body or powder, such as granulated slag, wood chips, sand, styrene foam, paper, etc., is placed in a tower-like structure having a cavity inside, such as a combustion chamber of a hot blast stove. If the filling is performed from the top of the building, the top of the filling itself becomes a scaffold for installing heavy equipment as well as a human in the building, and an expensive scaffold such as steel and wood which needs to be manually assembled. It has been found that it can be used as a substitute for wood. The present invention has been made based on the above findings.

The refractory dismantling method for a vertical tubular structure according to the present invention comprises the steps of: (a) charging and charging a lump or powder into a vertical tubular structure having a refractory inner wall and a hollow interior; (B) installing a refractory dismantling and discharging means on the surface layer of the filled lump or powder; and (c) refractory and the lump filled by the refractory dismantling and discharging means. Dismantling and then unloading the body or powder; and (d) moving the refractory dismantling and unloading means onto a surface layer of the mass or powder newly appearing after being dismantled and unloaded, Further, by the refractory dismantling and carrying out means,
Disassembling the refractory and the lump or powder, and then carrying out the step (e) repeating the step (d) while moving the refractory dismantling and unloading means downward to remove the refractory and the lump; And the step of completing the disassembly of the body or powder. Further, the present invention is characterized in that granulated slag, wood chips, sand, styrene foam or paper is used as the mass or powder.

[0016]

[Function] In a tower-like structure having a cavity inside, such as a combustion chamber of a hot blast stove, an inexpensive, lightweight mass or powder having a small bulk specific gravity, such as granulated slag, wood chips, sand, styrene foam or paper, If you put it in from the top of the structure and fill it from the bottom,
Since the surface portion of the filled mass or the powder itself serves as a scaffold in the structure, the work of installing the scaffold is eliminated, and the operator does not need to enter the structure. In addition, the cost of the scaffold is about the cost of the input mass or powder, and the cost can be kept low. Further, since the scaffold formed by filling the injected mass or powder is as strong as the ground, even heavy heavy equipment that cannot be installed with the conventional scaffold can enter the inside of the structure. If it is large, it can be installed without danger of scaffold collapse, and secure safety can be ensured in the refractory dismantling work process.

[0017]

Next, the present invention will be described with reference to the drawings.

FIGS. 1 and 2 are sectional views of a hot stove combustion chamber according to an embodiment of the refractory dismantling method of the present invention.
As shown in FIG. 1, the granulated slag 7 is charged into the combustion chamber B by filling. Thereby, it becomes a state similar to heat storage room A (refer to Drawing 3), and heavy equipment 6 can be installed on the surface layer of granulated slag 7. Since the granulated slag 7 is sandy and has a high fluidity, it is easy to discharge the granulated slag 7 out of the furnace at the same time as the peripheral wall brick 2. Then, by carrying out the granulated slag 7 together with the dismantled peripheral wall brick 2 by the heavy equipment 6 installed on the surface layer of the granulated slag 7, the filled granulated slag newly appears sequentially from below. As shown in FIG. 2, if the heavy equipment 6 is moved toward the granulated slag 7 dug down and the scaffold is changed, the scaffold necessarily moves downward toward the lower part of the combustion chamber, so that the peripheral wall brick 2 is entirely covered. Can be dismantled. In addition, the movement of the scaffold is smooth, and safety related to heavy equipment is extremely high.

As the lumps or powders, in addition to the granulated slag used in the present embodiment, inexpensive waste materials having a low bulk specific gravity such as wood chips, sand, styrene foam, and paper can be used.

[0020]

As described above, according to the present invention, a tower-like structure having a cavity inside a combustion chamber or the like of a hot blast stove,
For example, in the case of the hot-blast stove combustion chamber shown in the embodiment, a light mass or powder such as granulated slag is charged and filled into the inside of the furnace from the upper part of the combustion chamber, and the inside itself is used as a scaffolding material. All steel scaffold assembling work and high-altitude work associated with the assembling work are unnecessary, and the use of heavy equipment has enabled the construction period to be reduced to about 1/3, and the conventional dismantling period is three months. If there were, it would be one month and labor costs would be low, and in this case, heavy equipment for dismantling could use general-purpose products used for road construction, etc., so there was no need for heavy equipment development costs, etc. The dismantling cost can be reduced, and the refractory can be dismantled efficiently and inexpensively in a short period of time after securing sufficient safety, and thus,
An industrially useful effect is provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a hot stove combustion chamber according to an embodiment of the method of the present invention.

FIG. 2 is a sectional view of a hot-blast stove combustion chamber according to an embodiment of the method of the present invention.

FIG. 3 is a sectional view of a hot air stove heat storage chamber.

FIG. 4 is a sectional view of a hot stove combustion chamber.

FIG. 5 is a cross-sectional view showing a state where a scaffold is assembled in a hot stove combustion chamber.

[Explanation of symbols]

 A Thermal storage room B Combustion chamber 1 Steel shell 2 Perimeter brick 3 Checker brick 3a Upper surface of checker brick 4 Cavity 5 Scaffold 6 Heavy equipment 7 Granulated slag 8 Worker

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Shoji Oginuma 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. (56) References JP-A-7-120165 (JP, A) JP-A Heisei 3-81468 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) E04G 23/08

Claims (2)

(57) [Claims] 1. A step of charging a lump or powder into a vertical cylindrical building having an inner wall made of a refractory material and having a hollow inside, and (b) filling the lump or the filled lump or powder. Installing a refractory dismantling and discharging means on the surface layer of the powder; and (c) disassembling the refractory and the filled block or powder by the refractory dismantling and discharging means, and then discharging the refractory. (D) moving the refractory dismantling / discharging means on the surface layer of the lump or powder newly appearing after being dismantled and discharged, and then further moving the refractory by the refractory dismantling / discharging means; And dismantling the mass or powder,
And (e) moving the refractory dismantling and unloading means downward while repeating the step (d) to complete dismantling of the refractory and the block or powder. A method for dismantling refractories of a vertical cylindrical structure. 2. The method according to claim 1, wherein the mass or powder is granulated slag, wood chips, sand, styrofoam or paper.